Networking Silicon — 82540EP

4.4AC Characteristics

Table 9. AC Characteristics: 3.3 V Interfacing

Symbol

Parameter

Min

Typ

Max

Unit

 

 

 

 

 

 

PCICLK

Clock frequency in PCI mode

 

 

66

MHz

 

 

 

 

 

 

Table 10. 25 MHz Clock Input Requirements

Symbol

Parametera

Min

Typ

Max

Unit

 

 

 

 

 

 

fi_TX_CLK

TX_CLK_IN frequency

25 - 50 ppm

25

25 + 50

MHz

ppm

 

 

 

 

 

 

 

 

 

 

 

a.This parameter applies to an oscillator connected to the Crystal One (XTAL1) input. Alternatively, a crystal may be connected to XTAL1 and XTAL2 as the frequency source for the internal oscillator.

Table 11. Link Interface Clock Requirements

Symbol

Parameter

Min

Typ

Max

Unit

 

 

 

 

 

 

fGTXa

GTX_CLK frequency

 

125

 

MHz

a. GTX_CLK is used externally for test purposes only.

Table 12.

EEPROM Interface Clock Requirements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

Parameter

 

Min

 

Typ

 

Max

 

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

fSK

 

 

 

 

 

 

1

 

MHz

 

 

 

 

 

 

 

 

 

 

 

 

Table 13.

AC Test Loads for General Output Pins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

Signal Name

 

 

Value

 

Units

 

 

 

 

 

 

 

 

 

 

 

 

 

CL

TDO

 

 

10

 

pF

 

 

 

 

 

 

 

 

 

 

 

 

 

CL

PME#, SDP[7:0]

 

 

16

 

pF

 

 

 

 

 

 

 

 

 

 

 

 

 

CL

EE_DI, EE_SK

 

 

18

 

pF

 

 

 

 

 

 

 

 

 

 

 

 

 

CL

RX_ACTIVITY, TX_ACTIVITY, LINK_UP

 

 

20

 

pF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Datasheet

21

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Image 27
Intel 82540EP manual AC Characteristics